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arXiv · 1109.1947

On cross product Hopf algebras

D. Bulacu·S. Caenepeel·B. Torrecillas
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Abstract

Let $A$ and $B$ be algebras and coalgebras in a braided monoidal category $\Cc$, and suppose that we have a cross product algebra and a cross coproduct coalgebra structure on $A\ot B$. We present necessary and sufficient conditions for $A\ot B$ to be a bialgebra, and sufficient conditions for $A\ot B$ to be a Hopf algebra. We discuss when such a cross product Hopf algebra is a double cross (co)product, a biproduct, or, more generally, a smash (co)product Hopf algebra. In each of these cases, we provide an explicit description of the associated Hopf algebra projection.

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D. Bulacu, S. Caenepeel, B. Torrecillas. 2011-09-09. On cross product Hopf algebras. https://arxiv.org/abs/1109.1947

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